IKVM.NET is an open-source implementation of the Java Virtual Machine (JVM) for the Microsoft .NET Framework. It allows developers to:
Supermicro's remote management system uses this JAR file to launch the Virtual Console ikvm--v1.69.21.0x0.jar
Version V1.69.21 is generally recognized as a stable version that successfully fixes virtual media storage issues (mounting ISOs) that were broken in 1.69.20. The JAR would, when loaded through IKVM, download
In 2016, a threat actor named "ZeroK" distributed a modified ikvm-0x0.jar via compromised NuGet packages. The JAR would, when loaded through IKVM, download a Cobalt Strike beacon into the .NET process memory. Context of Version V1
This JAR file acts as a Java Web Start application that allows a remote user to view the Supermicro server's console, control the keyboard/mouse, and map local ISO images as virtual media to install operating systems, even if the server is powered off (but connected to standby power). 2. Context of Version V1.69.21
Here’s the unique twist: IKVM JARs used with ikvmc -target:exe are . If you rename the file to .dll and open it in ILSpy, you would see a .NET manifest and CIL code, not Java bytecode.
| Platform / Use | Typical Filename | Description | | :--- | :--- | :--- | | Windows Installer | ikvm-8.1.5717.0.msi | Installer for the full IKVM toolchain. | | Binary Zip | ikvm-8.1.5717.0.zip | Contains ikvmc.exe , ikvmstub.exe , ikvm.dll , etc. | | NuGet Package | IKVM-8.1.5717.0.nupkg | For adding IKVM to .NET projects. | | Converted Java Library | myJavaLibrary.dll | Output of ikvmc myLibrary.jar . |